WYEOMYIA PSEUDOPECTEN 119 



WYEOMYIA PSEUDOPECTEN Dyar & Knab. 



Wyeomyia ulocoma Dyar & Knab (not Theobald), Joum. N. Y. Ent. Soc, xiv, 229, 1906. 

 Wyeomyia ulocoma Dyar (not Theobald), Proc. Ent. Soc. Wash., vlii, 19, 1906. 

 Wyeomyia pseudopecten Dyar & Knab, Proc. Biol. Soc. Wash., xix, 139, 1906. 

 Wyeomyia pseudopecten Theobald, Mon. Culic, v, 624, 1910. 



Oeiqinai, Description^ of Wyeomyia psetidopecten : 



Prothoracic lobes entirely dark; occiput blackish with a lighter brown central 

 stripe; eyes broadly margined with white. 



8 specimens, Trinidad, B. W. I. (A. Busck, F. W. Urich). 



Type. Cat. No. 9997, U. S. Nat. Mus. 



The larvae of this form were described as W. ulocoma Theob. (Journ. N. Y. ent. 

 soc, xiv, 229, pi. xvi, fig. 73, 1906), following Mr. Coquillett's determination, with 

 which we can not agree after seeing the specimens. W. ulocoma was described from 

 Guiana and is, no doubt, a distinct species. 



Description of Female, Male, and Larva of Wyeomyia pseudopecten: 



Female. Proboscis rather short, swollen apically, the vestiture black with a 

 bronzy reflection, brighter beneath ; labellse small, rounded, with fine outstand- 

 ing setse. Palpi short, flattened, one-sixth as long as proboscis, bronzy black. 

 Antennae moderate, the joints slender, subequal, rugose, coarsely pilose, black ; 

 tori subspherical, with a cup-shaped apical excavation, luteous brown, with a 

 whitish pruinosity; hairs of the whorls long, rather sparse, black. Clypeus 

 rounded, convex, brown, pruinose. Eyes separated at the vertex by a narrow 

 wedge, bluish black. Occiput clothed with flat blackish scales with a metallic 

 reflection, a small white spot at the vertex, narrowly continued along the margin 

 of the eyes and expanded to a patch below; a median longitudinal shade, pale 

 with iridescent reflection ; two long bristles at the vertex and a row of shorter 

 ones along margin of eyes. 



Prothoracic lobes elliptical, well separated, clothed with flat scales, dark 

 bronzy brown, a row of set^ along anterior margin. Mesonotum clothed with 

 elliptical, flat brown scales with a bronzy and blue reflection ; a few pale scales 

 at anterior margin, those below the lateral angles pale with blue luster; setse 

 over roots of wings black. Scutellum trilobate, with vestiture similar to and 

 continuous with that of mesonotum, each lobe with a small tuft of black 

 bristles. Postnotum elliptical, prominent, dark brown, a group of small seta; 

 near posterior margin. Pleurae and coxae luteous, clothed with elliptical, flat 

 silvery-white scales. 



Abdomen subcylindrical, compressed, truncate apically and with many long, 

 dark-brown terminal sets; dorsal vestiture black, with a slight metallic reflec- 

 tion ; venter yellowish white, the colors separated at the sides in a straight line. 



Wings rather narrow, hyaline; petiole of second marginal cell one-fourth as 

 long as its cell, that of second posterior cell shorter than its cell; basal cross- 

 vein distant its own length from anterior cross-vein; scales of veins dense, 

 broadly ovate, tips obliquely subtruncate, brown, with a bronzy reflection on 

 costa. Halteres whitish with black knobs. 



Legs rather long and slender, black with bronzy and blue reflection, femora 

 pale beneath, tibige and tarsi bright bronzy beneath ; mid tarsi with a pale-brassy 

 luster beneath, almost silvery on second and third joints ; hind tarsi pale brassy 

 with fourth and fifth joints silvery white beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 3.3 mm. 



Male. Proboscis with a pale brassy luster beneath. Palpi as in female. 

 Antennae similar to those of the female, the joints with a small secondary sub- 

 apical whorl, the basal whorls with longer, more abundant hairs than in the 

 female. Coloration similar to the female. Abdomen subcylindrical, somewhat 

 expanded towards tip, with numerous terminal bristles, the claspers conspicuous. 

 Wing narrow, the venation similar to that of the female, the vestiture slightly 



